| Patents for C09B 17 - Azine dyes (304) | |
|---|---|
| 10/1976 | |
| 10/19/1976 | US3986888 Process for the preparation of the β-modification of tetrabromo-8,8'-dihydroxynapthazine in pigment form |
| 09/1976 | |
| 09/21/1976 | US3981677 Oxidative hair dye compositions containing N-substituted o-phenylenediamines and method for their use |
| 08/1976 | |
| 08/03/1976 | US3972879 Urea or thiourea, precipitation |
| 06/1976 | |
| 06/15/1976 | US3963715 Substituted pyrazines |